等差数列中,a3=-12,a3,a7,a10成等比数列,求公差d

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等差数列中,a3=-12,a3,a7,a10成等比数列,求公差d
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等差数列中,a3=-12,a3,a7,a10成等比数列,求公差d
等差数列中,a3=-12,a3,a7,a10成等比数列,求公差d

等差数列中,a3=-12,a3,a7,a10成等比数列,求公差d
a3=-12
a7=-12+4d
a10=-12+7d
a3,a7,a10成等比数列,故 a7的平方=a3*a10
解得d=0 或 3/4